Color Diamond Overtones- When a Diamond Has More Than One Color

Hey everyone, this is Daniel Namdar with #Diamondtalk. Today, I wanted to explain a very interesting topic that frequently comes up when dealing with natural fancy color stones: Color Diamond Overtones, also known as “modifying colors.”

We all understand primary colors like blue, red, and yellow, and secondary colors like purple or orange. In general, when we identify objects in daily life, we describe them as one solid color—like a “blue bag” or a “red brick.” However, that visible color isn't always the only one in play.

Take a lime for example. A lime is green, right? People even use the term “lime green.” While it’s primarily green, limes also have a distinct touch of yellow underneath. If you look at a lime next to a blade of grass, they are both green, but they don't look like the same exact color because of that underlying yellow overtone.

How the GIA Grades Secondary Colors

Because the tone or hue of a stone affects its value tremendously, the GIA is extremely specific when identifying secondary colors. They can attribute up to three colors to a single gem. For example, a diamond might be certified as a “Fancy Grayish Yellowish Green” or a “Fancy Brownish Orangey Pink.” In every GIA certificate, the very last color listed is always the primary color.

Do Overtones Affect Diamond Value?

Absolutely. It just depends entirely on what the “modifying” color is. As a general rule, "straight colors" (diamonds with no modifiers) command a premium because of straightforward consumer demand. When someone envisions a yellow diamond, they usually picture a pure lemon yellow rather than a brownish yellow. Similarly, someone shopping for a blue diamond typically wants a pure sky blue over a grayish blue.

However, certain modifiers can add a level of sweetness that straight colors lack. For instance, a Fancy Purplish Pink Diamond often exhibits a highly desirable "bubblegum pink" appearance that collectors adore, even though a straight pink diamond is technically rarer on paper.

Choosing the Right Stone

The world of overtones is endless, and choosing a diamond ultimately comes down to personal taste. Some people simply prefer a lime green to a grass green, and there is no right or wrong answer. Because no two stones are identical, it is crucial to work with an experienced professional who can explain exactly how a specific overtone impacts both the visual beauty and the market value of your stone.

Ready to find your perfect hue? Explore our curated collection of GIA-certified Fancy Color Diamond Jewelry handcrafted right here in New York City.